논문 상세보기
In this study, centrifuge model tests were performed to evaluate the seismic response of multi-DOF structures with shallow foundations. Also, elastic time history analysis on the fixed-base model was performed and compared with the experimental results. As a result of the centrifuge model test, earthquake amplification at the fundamental vibration frequency of the soil (= 2.44 Hz) affected the third vibration mode frequency (= 2.50 Hz) of the long-period structure and the first vibration mode (= 2.27 Hz) of the short-period structure. The shallow foundation lengthened the periods of the structures by 14-20% compared to the fixed base condition. The response spectrum of acceleration measured at the shallow foundation was smaller than that of free-field motion due to the foundation damping effect. The ultimate moment capacity of the soil-foundation system limited the dynamic responses of the multi-DOF structures. Therefore, the considerations on period lengthening, foundation damping, and ultimate moment capacity of the soil-foundation system might improve the seismic design of the multi-DOF building structures.
2. 원심모형실험
2.1 실험모델
2.2 지반특성
2.3 입력 지진파
2.4 가속도 계측 계획
3. 실험결과
3.1 가속도시간이력 및 주파수 특성
3.2 주기증가효과
3.3 기초감쇠효과
4. 기초의 지지력에 대한 다자유도 구조물의 응답제한
4.1 해석모델
4.2 얕은 기초의 최대 모멘트 내력
5. 결 론
REFERENCES
